added UUID Generator implementation

Author: gopalbala

.gradle/5.2.1/executionHistory/executionHistory.bin

@@ -2,7 +2,7 @@
 
 import com.gb.didgen.exception.ClockMovedBackException;
 import com.gb.didgen.exception.NodeIdOutOfBoundException;
-import com.gb.didgen.service.IdGenerator;
+import com.gb.didgen.service.SequenceIdGenerator;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.GetMapping;
@@ -11,10 +11,10 @@
 @RestController()
 public class IdGeneratorController {
     @Autowired
-    private IdGenerator idGenerator;
+    private SequenceIdGenerator sequenceIdGenerator;
 
     @GetMapping(produces = {"application/JSON"})
     public ResponseEntity<?> getNextId() throws NodeIdOutOfBoundException, ClockMovedBackException {
-        return ResponseEntity.ok(idGenerator.generateId());
+        return ResponseEntity.ok(sequenceIdGenerator.generateId());
     }
 }

.gradle/5.2.1/executionHistory/executionHistory.lock

@@ -1,10 +1,5 @@
 package com.gb.didgen.service;
 
-import com.gb.didgen.exception.ClockMovedBackException;
-import com.gb.didgen.exception.NodeIdOutOfBoundException;
-import org.springframework.stereotype.Service;
-
-@Service
 public interface IdGenerator {
-    long generateId() throws ClockMovedBackException, NodeIdOutOfBoundException;
+    String generateId();
 }

.gradle/5.2.1/fileHashes/fileHashes.bin

@@ -0,0 +1,10 @@
+package com.gb.didgen.service;
+
+import com.gb.didgen.exception.ClockMovedBackException;
+import com.gb.didgen.exception.NodeIdOutOfBoundException;
+import org.springframework.stereotype.Service;
+
+@Service
+public interface SequenceIdGenerator {
+    long generateId() throws ClockMovedBackException, NodeIdOutOfBoundException;
+}

.gradle/5.2.1/fileHashes/fileHashes.lock

@@ -2,7 +2,6 @@
 
 import com.gb.didgen.exception.ClockMovedBackException;
 import com.gb.didgen.exception.NodeIdOutOfBoundException;
-import lombok.AllArgsConstructor;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
@@ -13,7 +12,7 @@
 import static com.gb.didgen.common.Constants.SEQUENCE_BIT_LEN;
 
 @Service
-public class SnowflakeIdGenerator implements IdGenerator {
+public class SnowflakeSequenceIdGenerator implements SequenceIdGenerator {
     @Autowired
     private Integer generatingNodeId;